Yes, the sales cycles in government are a lot longer (2 years is at the extreme end though, 3 to 6 months is more average but with a lot of caveats) and yes, there are a lot of rules and regulations that don't exist in commercial deals (FAR, DFARS, etc. etc.) - but at the end of the day, you're talking about business-changing scale when you get awarded a decent sized government contract (millions of dollars over a period of 3-5 years on average or longer). You're talking about being able to grow to 100's of employees with just a half dozen or so government customers.
The problem here really is that people need to invest the time and energy into understanding the government market and they can't expect it to be like the commercial one. If you do this, then the payout is very much worth it (and, no, it doesn't require "deep pockets" but it DOES require relationship building, a strong commitment, and a lot of learning).
If you give up in frustration because "it's too convoluted" compared to the commercial market, then, yeah, it will never pay off and it will feel like everything is stacked against you. But if you stick it out you'll find yourself with some incredibly stable and predictable long-term revenue streams.