Personal node: Nodl Vs. MyNode Vs. DIY

I've been looking into getting my own node and have a few questions:The first post I made stating interest in a node I didn't know what options there were, now I have a better idea. DIY or out-of-the-box (Nodl or MyNode are the two I'm looking at).#1 Why go DIY > one of the above mentioned?#2 I loathe Amazon and refuse to buy from there, is there somewhere else with 8gb Pi 4s in stock?#3 Why not go with Nodl or a MyNode?#4 Does a personal node mine at all? I know the power required to do any real mining is massive, but I'm just wondering if a Pi 4 node does, literally, any mining whatsoever. I mean on a truly technical level. Does it mine, actually, 0%? Or it is effectively 0%, such as 0.0000000000000000000...01%