I'd love to learn more about how convertible debt (like this) works for early stage tech startups.
For example they loan you $100k to get started. 6-9 months later you get a VC to invest $1MM at a $1MM pre-money valuation. The VC now owns 50% $1MM/$2MM post money and Spark owns 6% $120k/$2MM
Edit (think you were asking a different question) -- as I understand it, convertible bonds usually have a low interest rate and long duration, so you aren't supposed to feel like they need to be repaid immediately. If there's no future financing, but your business starts making money slowly, you'll eventually have to repay it, yeah.