Developers don’t have reputation for spending metric shed loads of money, but that is *also* a true statement of (some of) their behavior. There are many devtools companies.
You can get exposure for free on Twitter and it is worth what you paid for it. If someone ever offers this, ask to see the marketing plan and specific commitments.
e.g. “We will promote you to our list of 100k email subscribers” is greater than nothing
If you collect the attention of pathological customers with free or deeply underpriced offerings, the referrals and exposure you get will be to people offering mostly more of the same.
Sophisticated businesses want their key suppliers to be stable, because ripping suppliers out of their business processes sucks and you have to do it if the supplier goes under.
Your customers want you to succeed.
If a coffee conversation went well and someone was a qualified buyer, escalate to “Want a proposal?”
I have watched people get mad and burn bridges over “Can you come give a talk at my company?” because they were offended about being asked for free work.
Talk to a good lawyer sometime informally if you want to see someone very good at this in action. They are generally good about informally giving pointers but if you ask for a contract review Shields Up.