It depends on what you are doing with it and what you are comparing it to. For 50 Gigs, its extremely cheap.

But if you really say want 5 gigs, then $10 a month seems a bit high, especially now that Gdrive gives you 5 gigs free.

Its also a bit of a pyschological barrier seeing that second digit in the monthly bill as opposed to say $5/month and knowing that the yearly cost breaches the triple digit barrier.