Hmmmm, I’d say try it out! There’s no way to know unless you begin the account and measure your growth. If it’s growing at 1000 followers or more per month after month 3 it’s a good niche. If it’s not growing at that pace, then it’s likely not a good niche. In terms of potential customers, you’ll only likely get paid if there are hundreds of small customers who actually need to value gained from the exposure from your account. if there are a small number of potential customers who already have a following there isn’t much value gained from being promoted by your account. Hope this helps!