Only you will know if you are close enough or willing to travel to get your moneys worth out of the venues.
We’ve never bothered – our kids are Lego nuts but not into the other attractions (now aged 10 and 7). We have got Legoland annual passes every couple of years and then travelled down 2-3 times a year (we are near Derby) to make a few days use of it, then left it a couple of years while they grow and change what they want to do before going back.
Oh yes, passes via Tesco clubcard points, accommodation booked at Travel Lodge in central Windsor months in advance to get cheap rates…