To most developers, interesting problems and technologies are part of the compensation. To attract talent to work for unattractive technology you'll need very attractive salary and benefits. If a developer can't expect to gain transferrable skills from a job, that must be factored in. Jobs where you gain experience nobody else needs are the start of many year-end careers.

OTOH, sexy startups often get away with paying less but, in return, offer environments a DAX-level customer simply can't.