Really? IMO 3x profit is a terrible multiplier. Depending on the business, 3x revenue could be worth it, but that's a completely different calculation. Of course, it also depends on how much work you're doing to sustain that profit. If you're working full-time to make this happen, 3x profit is a more attractive proposition than if you're just cashing the checks.
TBH, 3 years of profit upfront is probably worth it if you have no good plans to expand that profit.