Answer to the first question, based on one's delegation, they will get the INV tokens every week.
If there is excessive amount of delegation then that would also helps us create more accounts. So count of 300 will increase subsequently.
Right now the price of the Token is dirt cheap. You can buy it as well, Yes.
I hope these answer your questions. :) Cheers and Invite someone today. ;)
RE: Community Feedback: INV Tokens Trading Live on Steem-Engine