To increase the SPA price would meant more legal costs to be incurred as all the legal cost is tied back to that price.
Unless you're willing to pay on behalf of the house owner the legal cost charged to him.

This post has been edited by b00n: Jul 14 2009, 03:45 PM

I wouldn't say whether or not it's legal or illegal.
Again, there could be abuse and dispute in this matter if both didn't really reach a fruitful agreement.

Like mentioned before, to jack up the price in the SPA; the seller would need to foot a higher legal cost. Are you willing to pay on his behalf?

2ndly there might be some implication when dispute arises. Since it's stamped and all, the seller actually have the right to request and demand for the amount stated in the SPA where you're not going to win in such dispute cases.

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Added on July 14, 2009, 4:26 pmaw...jason posted before me while I'm typing while on phone.

This post has been edited by b00n: Jul 14 2009, 04:26 PM

The letter if produced in court might worked against buyer as cheating the bank to get a higher loan MOF.
Used the word "might" as we do not know what's the verdict yet.

All being said, it's just how willing are you to take up the risk and cost that is highlighted.