Donation Rank up with coins from the market?

Why don't you guys make it possible for people to buy donation ranks with coins.Getting coins from the market with gold or items or w/e other thing they sell still makes some other guy to donate and be able to buy it. Yes that means 2 people are getting donation ranks at the same time,so if you consider it maybe make it to cost double the amount of coins needed from regular donation.

Beacuse its not the same if you donate physically 1000 usd or buy virtual currency with virtual items.

Donation Ranks come from donating. If you just get coins from dealing in the Marketplace without donating, you don't get Donation Ranks.
It's as straightforward as it gets, the name says it all - it's Donation Rank, not Got Coins Rank.