Should I pay to be an affiliate?

Should I consider paying to become an affiliate? I've been thinking about expanding my reach in the cryptocurrency and finance space, but I'm unsure if investing in an affiliate program is the right move. On one hand, it could potentially bring in new clients and revenue streams, but on the other, there's always the risk of not seeing a return on my investment. What are the pros and cons of paying to be an affiliate, and how can I determine if it's a worthwhile investment for my business?