Yes, over the years, Citibank have offered me both upgraded cards and higher credit limits. As well as the opportunity to have two cards ( A mastercard and a visa). Plus a pre-approved ready credit account. Plus several other offers I have likely forgotten about
netaddict, I would get a credit limit increase about once every 3 months (I suppose I do have 4 CC's so numerically that means 1 per year for each card). Note that 2 cards are personal (Amex & NAB M/C); two are for business expenses (CB Plat & ANZ QF Visa); so excellent for balance transfers and FF points. However, it means that I have to constantly be on top of my balances to ensure that I only pay deductible interst (as I do from time to time).
Had a CL increase from CB Platinum last month that I accepted and another from my ANZ card today that I won't (as a result no doubt of me "paying off" my sizeable outstanding balance last month). Alas, I'll turn that one down as my CB Plat has more than enough CL.