Anyone can afford a dollar. I'm guessing the real reason these people don't pay is because they don't think it's worth paying $1 to generate a meme.
IMO I think it makes more sense to put advertising on the main site and fund it that way. If I was a user of this service I'd prefer to have some ads on the site rather than paying $1 for it. I don't feel it makes sense to remove the branded gifs...that's how you will grow your business, and it's not worth removing it because someone is just too cheap to pay.
Anyway, it's your business and not mine, so do what you feel is best.
IMO I think it makes more sense to put advertising on the main site and fund it that way. If I was a user of this service I'd prefer to have some ads on the site rather than paying $1 for it. I don't feel it makes sense to remove the branded gifs...that's how you will grow your business, and it's not worth removing it because someone is just too cheap to pay.
Anyway, it's your business and not mine, so do what you feel is best.