My total gil investment on upbeat is what I would consider small it's a lot for a normal player but upbeat is an ultimate character 

First relic 120m with the upgrades around 200m 320m 

All other relics around 60-100m (16 total) 1.2b

Bonecraft 110 around 600m

Empy harp around 300m

Escutcheon my most expensive thing 2.4b

3 mythics at 300m each 900m total

All spells around 20m

Ebisu around 20m

If I took an honest guess without adding everything up

I would say upbeat has about 8b spent

8,000,000,000 gil

Almost all that gil was made from bonecraft

My ls helped pay for my bonecraft to 110