The founder needs to be serious about it. If they have the funds to invest into it, then why wait for seed funding? ex. Co-founders had millions in their bank accounts. Despite the app's successful growth, they did not did not have the heart to invest more money into it. What are you thoughts?
So far in my life, I was Entrepreneur twice in US building call center technologies and Healthcare IT services. To me, having a good idea which solves real world problems is the first major step one need crossover. However, having investments, teams, ets are next important steps. If we have the good compelling idea and solution, others would flow in.