Tax on the Austrian Silver Philharmonic coin?

Why does the Austrian Government chooses to tax the silver bullion coins but not the gold bullion coins. I mean, aren't they both legal tenders ?
I wouldn't usually worry about it; however the tax is like 20%. Its huge!

excuses to make money

4-2010 Austrian Philharmonic 1 Troy Ounce .999 Pure Silver Coins $147.45

2008 PHILHARMONIC 1,50 Euro Silver Bullion Coin 1 oz. $54.95

2011 SILVER PHILHARMONIC Austrian Coin .999 Silver Bullion 1 toz. Uncirculated $34.05

2011 SILVER PHILHARMONIC Austrian Coin .999 Silver Bullion 1 toz. Uncirculated $31.00

2011 SILVER PHILHARMONIC Austrian Coin .999 Silver Bullion 1 toz. Uncirculated $30.00

1 oz Silver Austrian Philharmonic Coin 2011 - One Troy oz .999 Bullion $38.04

SILVER Coin 1 oz 2012 AUSTRIA Austrian VIENNA PHILHARMONIC Pure .999 STUNNING BU $46.00

2008 Austrian Silver PROOF-Like Philharmonic Euro Coin from Roll w/air-tight $36.80

4 x 1 oz Silver Austrian Philharmonic Coin 2011 - One Troy oz .999 Bullion $126.50

1 oz Silver Austrian Philharmonic Coin 2011 - One Troy oz .999 Bullion $31.09

Austrian Philharmonic 1 Oz Solid Silver Coins X 3 $140.62

2 X SILVER CoinS 1 oz 2011 AUSTRIA Austrian VIENNA PHILHARMONIC Pure .999 BU $86.00

2009 AUSTRIAN SILVER PHILHARMONIC ♦ ROLL OF 20 COINS BU $1,299.99

14K Yellow Gold and Black Onyx Weiner Philharmonic Coin Pendant $795.00

1 Silver Vienna Philharmonic 1oz. coin - 2011 $38.95

1 Silver Vienna Philharmonic 1oz. coin - 2011 $38.98

2008 AUSTRIAN SILVER PHILHARMONIC .999 SILVER---1 OZ COIN $33.00

2008 AUSTRIAN SILVER PHILHARMONIC .999 SILVER---1 OZ COIN $33.00

2011 SILVER PHILHARMONIC Austrian Coin .999 Silver Bullion 1 toz. Uncirculated $33.05

2008 AUSTRIA PHILHARMONIC SILVER BULLION COINS 1.50 EURO ( 4 ) TROY OUNCES .999 $137.50

2009 1,50 EURO AUSTRA PHILHARMONIC ONE OUNCE .999 SILVER COIN SS72 $44.99

2009 1,50 EURO AUSTRA PHILHARMONIC ONE OUNCE .999 SILVER COIN SS67 $49.99

2009 1,50 EURO AUSTRA PHILHARMONIC ONE OUNCE .999 SILVER COIN SS69 $49.99

2009 1,50 EURO AUSTRA PHILHARMONIC ONE OUNCE .999 SILVER COIN SS65 $49.99

2009 1,50 EURO AUSTRA PHILHARMONIC ONE OUNCE .999 SILVER COIN SS66 $44.99

2009 1,50 EURO AUSTRA PHILHARMONIC ONE OUNCE .999 SILVER COIN SS74 $44.99

2009 1,50 EURO AUSTRA PHILHARMONIC ONE OUNCE .999 SILVER COIN SS71 $44.99

2009 1,50 EURO AUSTRA PHILHARMONIC ONE OUNCE .999 SILVER COIN SS68 $44.99

2009 1,50 EURO AUSTRA PHILHARMONIC ONE OUNCE .999 SILVER COIN SS73 $44.99

2009 1,50 EURO AUSTRA PHILHARMONIC ONE OUNCE .999 SILVER COIN SS70 $44.99

SILVER Coin 1 oz 2012 AUSTRIA Austrian VIENNA PHILHARMONIC Pure .999 STUNNING BU $31.00

Mint Roll x 20 austrian 1/10 oz philharmonic gold coins $5,999.00

1/4 Ounce 24kt Gold -- 1999 -- Austrian Philharmonic Orchestra Gold Bullion Coin $468.00

AUSTRIAN PHILHARMONIC ROLL OF 20 COINS 999 1 OZ SILVER COIN 2011 $899.00

2011 AUSTRIAN SILVER PHILHARMONIC COINS NEW UNC 40 OZS,MINT ROLLS,FORTY,BULLION $1,588.00

SILVER Coin 1 oz 2012 AUSTRIA Austrian VIENNA PHILHARMONIC Pure .999 STUNNING BU $35.05

ZIMBABWE DOLLAR 75 BANK NOTES MIXED LOT 100 TRILLION + SILVER PHILHARMONIC COIN $149.99

2 X SILVER CoinS 1 oz 2011 AUSTRIA Austrian VIENNA PHILHARMONIC Pure .999 BU $86.00

2008 Austrian UNC Philharmonic Silver 1 oz. Coin $0.99

2009 Austrian UNC Philharmonic Silver 1 oz. Coin $17.45

2011 Silver Austrian Philharmonic $38.90 The Vienna Philharmonic, Europe's leading bullion coin, has created the silver Philharmonics in the same design as the classic gold bullion coin. Minted in .999 fine silver, one side of the silver Philharmonics features selected instruments of the world famous orchestra. The other side depicts the great organ of the Golden Hall in Vienna, site of the annual New Year's Day Concert....

2010 Silver Austrian Philharmonic $44.50 The Vienna Philharmonic, Europe's leading bullion coin, has created the silver Philharmonics in the same design as the classic gold bullion coin. Minted in .999 fine silver, one side of the silver Philharmonics features selected instruments of the world famous orchestra. The other side depicts the great organ of the Golden Hall in Vienna, site of the annual New Year's Day Concert....

2010 Austrian Philharmonics 1/10 Once Gold Coin $259.95 First minted in 1989, the Gold Austrian Philharmonics coin is one of the best selling and most respected gold coins in the world. An unusually beautiful and intricately engraved coin, the design pays tribute to the renowned Vienna Philharmonics Orchestra, one of the finest musical ensembles in the world. A harmonious design of musical instruments represents the world famous orchestra on the reve...

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