​If you have a solid product and good brand identity even if it was cheap to create, what’s stopping you from making endless sales just by increasing ad spend?

Like if I made a perfume brand, got some buzz around it by paying micro influencers and running insta/tiktok ads, if I make some sales with a small ad spend, what’s to stop me from making 6 figure profit months just by reinvesting profits into bigger ad spend?