At the level they are playing in Sweden they are apparently allowed up to 9 imports
Torlandas ground holds 1500 max and everything I've seen its not that different to what they'd be playing here, doubt they'd be getting paid a lot, travel and accommodation - probably similar to what imports that come here get. As Ole's involved the players are probably working as coaches
While the standard is likely to be similar, its probably more the fact its easier to get scouts from European clubs to visit Torslanda (which is just outside Gothenburg) than it is to get them to Porirua that makes it attractive
There is not huge money in Swedish football. As a guide from one source, I know of 2 x Superettan (2nd Tier) clubs currently looking for a left/right winger & Central attacking midfielder offering €1800 & €2500/month. (CAM gig includes accommodation). A 2nd Division club (4th tier like Torslanda) is looking for a striker at €150/month (accommodation not included).