Its not a bubble. $240k is a reasonable salary for a professional with good grades from a good university working for a highly profitable private company. In fact as long as there is such a gap between revenue per employee, and compensation per employee, there will only be upward pressure on pay and conditions.
In reality, software engineering salaries outside of established tech environments are kept artificially low because there is no "guild of software engineers", and therefore anybody can get hired no matter what level of skill they have.
I too run a software startup. The most common and serious error I see in my fellow startup founders is expecting to build better technology with worse pay and conditions. You might be able to wrangle something decent out of some poorly qualified yet smart people, but its a bit of a long shot.