Thanks for the upvote! The only practical reason I can think of is saving cost on hosting. If you wanted to invest 10000 Coins into a project and their masternodes were only 5000 Coins each, you would need to deploy 2 VPS servers. If they offerest a 5000 Coin MN and a 10000 Coin MN, then you could still invest 10000 Coins, but only deploy 1 VPS.
RE: Finding the Perfect Masternode Coin