doing the self sponsored type rating does not make ANY sense anymore... even if you want to avoid being bonded... well bonding is nothing more than that you have to pay a remainder of the bond when you do decide to leave.
there is no salary reduction for the bonded scheme... So let's do some maths in case you want to leave after 3 years.
bonding scheme: you'll pay 5k upfront.... after 3 years you will have to pay another 10k for the remainder of your bond, total of 15k
non bonded: you'll pay 30k upfront. And you won't get anything back after you leave after 3 years.
So even if you leave after 6 months (why would you do that anyways...) it will still be cheaper to be on the bonded scheme.