If you are doing this for earn some meoney then I am sure you can't even recover your paid money because most of users who up vote you don't even have that much Steem Power which influence your post value.
This is allowed.. Steem is a social network like facebook and twitter. as we can see people opening facebook/twitter campaigns. just like this now steem is on the trending. and now you'll see lots of Steem Campaigns come there..
My work:
Steem name: https://steemit.com/@ardenyham
btc addy: 1Ai1AvTbHf5C2e8E4jZtRgf5oLKumZwm5k
Username : pvaspecialist
Wallet : 1EFsKXnFbXsqhABu6xUEJ3dKiuECDFyrJ1
BTC: 13dbkKYvxGcYUiWhDboCG6xvtcxuo7mQm1
Ty
User: wry
BTC address: 1BLNZe7pQRoT8hba6exG8QUDy5iiNnnfrg
Good luck on steemit, I hope a whale comes and likes your post.
BTC adress: 3PpZ8ZxQFTjobfQsq6sisRBChnf2Ar9jTJ
thx