In my opinion meat bombing is a good way of getting familiar on type. For some reason people don't like bombers so its best not to spend too much time doing it just get a decent number of hours on the type and head off. As a result its really not worth it if your only in a 172 or something that its not often found in the industry.
It is good fun, a lot better than just a scenic flight (plus usually take longer) and usually there is an operation close to home. But often you don't get paid much if any (and when people find out you have worked for nothing they pretty much hate you.)