@alex Doesn't surprise me. Likely to be lots of situations where "elsewhere" isn't better enough to be worth the travel costs. Would often be better to just sit tight and hope.
Remember that their baseline metabolism is _much_ lower than us, and even lower than usual for insects, so they can sit around waiting for far longer than we ever could.
https://www.sciencedirect.com/science/article/abs/pii/0010406X70904834