Hence the inflated price.
Inflated price doesn't really help them beyond perhaps matching the seller's asking price and being sufficient for them to take it off the market and hang on while Omaze run the competition etc..
Wonder if they actually make much, I had this idea for auction/competition selling houses about 15 years ago but never progressed it.
They make 20% of the net proceeds, the charity gets 80% of the net. so for example they're estimating the charity gets 500k for this one and they'll make 125k, but I'd guess that 125k is likely mostly profit.
For example, it is a third-party company that administers the draw/handles the entry, so the operational costs of the competition are deducted, the cost of the house, furnishing it, other prizes etc.. will obviously be deducted, the video/photography/advertising costs will all be deducted. Legal fees, stamp duty etc.. all presumably costs to be deducted prior to the split.
So possibly the £125k or whatever low 6 figure sum they make per competition might pay the salaries of a presumably very small number of Omaze staff doing whatever stuff is left which hasn't been outsourced, or possibly there is a way for them to deduct some other costs too and that £125k or whatever they make might be nearly pure profit.