I'm not sure I get the comparisons to Norway. They are not in the EU and do ok, fair enough, but they are in the EEA and enjoy a free trade agreement with the countries of the EU. Now that would be all well and good for the UK but the 'price' of that free trade deal is to also have free movement of labour which is what seems to be motivating most of the Brexiters to want to vote leave in the first place. So if we are voting out to stop an influx of labour then we won't be wanting to have the free trade deal and the free movement of labour that would come with it, which means there will be tariffs and charges and bureaucracy on all goods and services bought and sold. So the things we buy from Europe will be more expensive and our living standards fall, and more importantly the things we sell will be more expensive, less of them bought meaning fewer of them made and fewer jobs in the UK. It would likely lower the value of our currency too making our money go less far and further lowering living standards.
I see people keep saying things like, "but we won't just stop trading with countries in the EU if we leave". Nobody is saying we will, but there will be tariffs on what we buy and sell and that will be economically problematic. Some people are underestimating what difference the free trade deal makes to our economy IMHO.
The other thing that grinds my gears is the trying to play on peoples' fear by saying Europe is going to be a federal superstate so we should leave. IF that were ever proposed, and it is decades off in my opinion if it were to ever happen at all, then there would certainly be a referendum on it and we can make a decision to leave or stay then. It is almost being implied by Brexiters that by voting remain now you are authorising being part of this mythical superstate. You are not.
I started out a few months ago with an undecided and open mind, but I just haven't heard a convincing argument as to why we should leave so I will be voting to remain. The other 'issues' like the free movement of labour, the EU being bureaucratic institution (yes it could be a hell of a lot better) or the sovereignty argument don't bother me too much, but economically I'm convinced leaving would be a disaster.