Bugs can make you a ridiculous amount of money...granted. But with the money you'd have to put out if you bought bug jars or the time and resources required to craft them, only half of what you sell the bug for is true profit. These 20-30 gralats are an adequate reward for the amount of work it takes to collect bugs, for while sometimes it can be easy, there are just as many times where it's frustrating.
More or less...a bug catching nerf is truly unneeded. Don't pull a classic era move and "fix" things that aren't broken.