Haha.... I do that too.
When the worker is harvesting (after I specifically ask for lower level farmers to help them out) I visit their farm.
If they say they are low 100s or under and it turns out they are much higher, or even maxed, I return and congratulate them on working just one farm and jumping so many levels.... and tell them thanks and good bye.
A couple days back I had 8 farms of fertilized rhubarb
( I do that for fun once in awhile) and some "grandma" avatar was begging for work. So I hired her when she said "no tools" and figured it would make her day. Wouldn't you know it, she harvested with a 4x4.
I questioned her and she said "... well, I don't have ALL the tools yet, and I don't plow, I just harvest"
I said "thanks, enjoy your level 176.... I have to go to the market now and find someone else for the other 7 farms of fertilized rhubarb.... good bye"
and I did....
I thank that level 45 farmer is STILL counting all the coin and points he made, while I did other things and just watched the screen.
Farm Town can be all sorts of fun.
.