Although, SSP may deflate the Mainland resale market again, with new buying opportunities that have been pricey since the doubling of bonus tier.
On the other hand, the new resident-to-resident auction system will make Mainland a more liquid "investment" when it finally goes live next year. Obviously pixel property is no kind of "investment" at all, but still it will be interesting to see how the market -- Mainland and Estate -- responds when folks can dispose of one Mainland parcel and buy another all with practically zero transaction cost and only a few days delay.