It's better to use it in every occasion pal, you need a bot now to run gbgs ???
Depends what you want to achieve with a particular hammer, many players have multiple hammers so why not have a capital hammer too? its the first one you can start properly anyways put aside a spawn hammer, also capital hammers have many advantages so not starting one unless you just build one single wwk all server wouldn't be the smartest move
even people in center with close fight would run gbgs at this stage
putting ressources into troops is total waste anyway, better sim all server
if you plan on queuing using GB GS to use a hammer right away thats not wise way to spend resources this early , you can make a great hammer for early wars from the capital without needing to spend 3x the resources, just need to be more active