How profitable is it to run a masternode? What's the lowest requirements for the hardware?
1000DRK needed, earnings are: ((576 blocks/day divided by number of masternodes) * 20% of block reward) so appx 0.6DRK/day currently ~ 22% annual return.
Minus about 5 bucks/quid/euros a month for hosting, which should get you 1GB RAM, 1 CPU, enough HDD space and bandwidth. Bandwidth is important, shop for lots of it.