Actually they plan to use a lot of the funds for real assets, like that btc atm machine and such. It's not all just for trading.
And I understand perfectly what you are saying. Except they won't have 75 btc + 250K coins. They will have 75 btc + 250K burned coins. We are assuming the valuation will increase at the same percentage of what they just spent ... but that isn't a certainty.
This is the part you're thinking about incorrectly.
Let's say there is only 2 BTC per coin and only 2 coins in scenario 1 and only 3 BTC per coin and only 1 coin in scenario 2. In both scenarios, assume buy-in price was 2 BTC per coin.
Scenario one.
100% total gain
They double their 4 BTC to 8 BTC. Each coin gets paid 4 BTC. Starting price was 2 BTC. Profit is 4 -2 = 2 per coin.
Scenario two.
100% total gain
They double their 3 BTC to 6 BTC. Each coin gets paid 6 BTC. Starting price was 2 BTC. Profit is 6 -2 = 4 per coin.
Get it?