I think that this greatly depends on where you're coming from. Last Feb coming from the US, DLP was MUCH cheaper than WDW is. We picked up AP's for about $200, as opposed to over $800 in the US. 3 days in the parks covered that pretty easily.For me though there are 2 others issues. It’s much better value going to Orlando. It’s pricier, but if you’re into parks, you’re getting 6 vs 2, and a much better entertainment district. It feels like prices have risen considerably since the Americans took over. There’s also the Universal, Seaworld, Busch, Legoland, Fun Spot consideration.
Even with the increases, the parks in the US have gone up just as much, if not more. Admissions and costs to visit DLP are drastically lower that what it costs in the US. Unless you're getting some fantastic deals, which I've heard they tend offer some to the UK that are much better than what those of us in the states that want to visit WDW can get.