cheep coilovers only adjust once or twice, dosent take them long to sieze.
they don't actualy last very long before the seals go and they leack, you put them on a track car you'll kill them a few hundred track miles or about 10-15 k on the road
a cheep spring a shock kit of roughly the same price will actualy be quite reasonable quality and have a sensible service life, proably see you out a season or two on the track or 5 - 10 years and 100k on the road, car will also handel better.