I think what you are trying to say is that you use Photoshop to sketch logos because creating logos in Photoshop is an absolute waste of time. Rough sketch in photoshop is what most of us do. if this is true then… I do not know what to say. How many anchor points you get with this? Million? Plus you have to separate each object that was traced and split that in layers, bottom line, if you draw something in Photoshop, then go to Illustrator and do not draw over it again, but you are using tracing, that is not vector logo and if there is any need for change or alteration it would be a pain in… That’s different. Mockups end results are photos A4 or A3 in size for which PNG is perfectly fine as format. But logo must be clear and vector, with layers and “normal” anchor points. And the buyer will prefer the illustrator guy over you.