I tend to drink it like that. Apparently it's not socially appropriate to drink hot sugar water, and I need the sugar.
My secondary issue is that most tea available now is quite crap quality. I don't need sugar in good tea, but good tea is not trivial to make, and requires good tea to work with. Failing that, masking the poor flavour with sugar helps.
Supermarket tea can be a bit of a crapshoot. Some is quite good, some is complete rubbish. Unfortunately, most places err towards cheap bulk tea, rather than expensive tea, particularly for workplace tea.
I'm personally also a bit of a tea snob (ok, a complete snob!). I've found a place in Bath that sells excellent tea. I've also taken the time to figure out the best way to brew it, to my tastes. Unfortunately, this also raises the bar on all other teas. It makes it obvious how bad the likes of PG shits etc are.