As I said Derek, they were built by companies like Bourbon, Vos, Maersk because of anticipated markets. When the global crash happened, everyone tightened their belts. The oil companies looked for cheaper options than what was on offer from the european shipping companies.
Say Maersk had a support vessel and it was costing the oil company 50.000€ a day to contract. Companies based in India and the far east bought up old ships, crewed them at their day rates and undercut to say 20.000€ a day to the oil companies. This left many european ships and crews idle as cheaper crews came in for the work. Health and safety and seaworthiness means nothing to these contractors, nor it seems the oil companies!
Think of it this way. a european seaman on 350€ a day, an indonesian on 40€ a day, guess which the oil companies went for? at 40€ this is a fortune for an indonesian worker. Unlike Australia, the US and Canada who protect their seaman by insisting on local crews, this does not really happen in europe.
Re reading your last post, is there some confusion? support vessels are owned by independent operators and are contracted by the oil companies - at the cheapest rate they can get. It seems even the oil companies are saving money on contractors, or should that be increasing profits at the expense of contractors?