of course a good investor will first do its own research (whitepaper, roadmap and etc), besides that what is your biggest motivation?
The main thing that usually gets my attention is when there are big names attached . If I see that an investment is attached to a big name I will usually feel kinda confident about it, cause since they are operating with a big brand why wont it be a good one? So its probably going to work out, but that doesnt stop me from making the proper research that Im supposed to make though. I still need to check everything about it to know if its going to be truly a good one.