Such a thing can indeed happen... once... four or five times, even.
However, for it to happen season after season, and for very similar things to happen with other, similar, bowlers, is not plausible. Eventually, no matter how stupid, a captain will see some sense and stick a third-man in.
Good balls conceding runs is not an incredibly regular thing. It can and does happen, but only from time to time.
More often than not, a bowler who has been expensive will have bowled inaccurately. That's not a stereotype or a generalisation, it's simple one-plus-one-equals-two.