Nothing's wrong with it. There's a weird minority of users on this board who spend way too much time on here and thus possess some distorted sense of ownership. It's annoying, but this forum does have some useful information from time to time, so casual users like you and me have to learn to ignore them. Whatever you do, do not respond to them.
As for what positions you could move up to...that I'm not sure about, but here's one story:
Gregory D. Wasson is the president of Walgreens, and CEO effective February 1, 2009.
Wasson joined the company as a pharmacy intern in 1980 while attending Purdue University's school of pharmacy, and managed stores in the Houston area before being promoted to a district manager position in 1986. Wasson was promoted to a regional vice president of the store operations division in 1999. In 2001, he was promoted again to Walgreens vice president and made an executive vice president of Walgreens Health Initiatives, the companys pharmacy benefit manager (PBM). Wasson was promoted to president of Walgreens Health Initiatives in 2002, Walgreens senior vice president in 2004 and to a Walgreens executive vice president in 2005. He was named president and chief operating officer of Walgreens in 2007. Following the departure of Jeff Rein from the position of CEO, Wasson was chosen as the new officer after a nationwide search for candidates, the first including external possibilities.
Bottom line, I think the only limits would be based on your capabilities.