To OP: I've seen at least one version of this idea already try here and fizzle out - I was amazed that people bought space then, although at $1,000, 1 BTC for first entry seemed worthwhile since it worked best for the first buyers.
I'd be careful about claims of adding value though. Crypto here is just your mode of payment, not the tech or even relevant industry. There are many who might feel that this ad structure somewhat damages reputation instead of adding value. I suggest you develop pixel tracking for crypto projects (dare I say, ICO?). At least the data derived from there might help ICOs learn better marketing/promotion strategies.
Thank you for your input!
I think that it is a great idea and you should do it! I offer you a 50% discount on purchasing ad-blocks on my website (applies to 4 blocks max).