I would do it to get rid of the bugs, before they got the whole tomato plant. There aren't completely safe and cheaper organic pesticides here in the developing world. The weeds I poison are recovered and dumped in the trash. They go to the dump, unfortunately we don't have toxic waste dumps here either. That's the best I can do.
I don't use pesticides in the greenhouse on the lettuce, which is also why I do hydroponic lettuce, much less prone to bugs. And one of the driving forces behind the greenhouse is to give an example of innovative, less toxic methods of agriculture. Less water, less fertilizer, no pesticides.
I have to admit though the reason I don't grow tomatoes is because of the bugs. I used to have some outdoors, and the bugs and diseases were overwhelming. So I asked someone at the local farmer's market, a huge weekend event (not organic) how they did it. Says he, "Oh, I must of sprayed them at least six times." I don't go to the market very often after that. Nowadays I buy most of my vegetables at Walmart, because I know they support farmers using better agricultural practices and even have tomato greenhouses. The original funding was from the Millennium Challenge (George Bush). See how the money circles back to the US. The US funds the farmers and the roads to get the produce to market, to Walmart. Unfortunately, I don't have any other choice for healthy eating.
Also, I probably wouldn't eat the larger tomatoes if I sprayed them. I'd wait for the smaller ones to grow.