The issue with sales in particular is that, if you can't figure out sales, don't expect a miracle by partnering up with someone. The sales-technical partnerships I have seen usually start with a great pre-business relationship. And those who have profitable bootstrapped business actually do hire salespeople like they hire me.... as disposable. You give them the initial pitch of what is the product, and you have them on commission-based pay. After the onboarding period ends, you make binary decisions of keeping and firing. Sounds unhealthy from the employees' side but that is side projects and bootstraps work.