5. Do you keep the same banker alt or do you change them up occasionally? Why?
Hmm well 'gearing' my bank alt with bags which become soulbound, and taking the time to create guilds for them and tabs, which technically I could transfer the rights to another character, I personally don't see the need to change bank alts once they are made.
The only change I made recently to a guild bank alt was the race I picked when I made my new banker on Stormreaver, due to transferring. I had a Blood Elf as my banker on Vashj, but Stormreavers alt is a lady Orc in a lovely pink dress! Haven't been able to find any pink shoes to cover those feet though....