That would be the way to go, however build in the initial cost, plus a suitable vehicle and travel costs and could it ever be profitable?
At $200 per job (which is less than the going rate), it could gross $1000 per day fairly easily. Include travel time and you're probably at $4000 gross per week for say 40 weeks a year. That's $160,000 per year. Deduct expenses and you're not going to be fabulously wealthy, but you'd do all right.
EDIT I suppose the real question would be is there enough demand to do 800 Plek jobs per year? I think the answer would be yes, but I tend to be an opptimist.