Yeah bro....
If you hit a curb/pot-hole hard enough..it will bend...or even break a rim.
My experience:
I have a set of 18" Racing Hart M7000's sitting in my living room because I caught the edge of a median and it literally took the lip of my drivers side front rim, bent it back, and proceeded to peel it from the rest of the rim...tire stayed on fine and didn't loose any air...but the rim was totally fukd...they are for sale by the way...cheap!
My brother has 19" Lowenhart LD1's on his 2004 CL Type-S and he just found out that he has a cracked rim...has to either replace it or weld his existing rim....
If you get a set of rims...you now have to be even more careful driving then you ever were before...especially if you have a smaller series tire...the bumps just get bigger and bigger with a smaller series tire...
CL