I charge Fiat, but I'll take crypto if they want to offer it, though I doubt any of my potential clients will want to pay in crypto right now. Because it's a monthly subscription, I'll help them dollar cost average into purchasing steem and spending it. The price of STEEM shouldn't affect their ability to promote much at all. They'll be spending it right away on promotional efforts.
With regards to downvoting, remember that I'm only targeting a few large customers so it's very hands on. I'll be actively advising them on what type of content will do well. Essentially I'll be their Steem social media manager... for the time being...
RE: Steemit Enterprise Ad Platform: A solution to vote bot abuse