You can earn all that back and more with BS gears. 5-10m per day niffing, depending on how many hours you're able to spend at it. I don't even have top gears, and I've made as much as 4m in a partial day (not even niffing the whole day). It definitely won't take you years to earn it back, but furthermore BS gears are a lot more useful for making money than IC gears. In other words, you can quickly (well, relatively) earn the money back for the IC gears if you have BS gears, but it will take you a long time to earn the money for BS gears if you only have IC gears.
At least that's my opinion, although maybe someone else will say something different (other than that, you could try MvPing with IC... I doubt you'll make money as quickly that way, but it's something to try - or you can party with a BS with your priest in niff, but then the money you make will be halved.)