Hello
I believe this is an obvious question however I could not find answer to it

.
I have a linode256 and I'm running out of bandwith (100GB). Now I have two options:
a) upgrade to linode384 (cost 30usd/month)
b) buy extras to my existing linode384 - I would need around 40GB/month which would cost 20usd/month (so overall cost of my linode would be 20+20=40usd/month)
I do not understanding this pricing now, cause option a) gives me not only the bandwith I need (150GB instead of 100GB) but also more ram, more cpu, more disk.
So now the question - why is the pricing created that way and what's the point at all in paying for "extras" (a very similar situation is the other resources) unless you are on linode 1024

?
regards
vanitas