If all you care about is making money, I'd recommend getting into investment banking or corporate management. If you actually enjoy working with computers, Linux is as good a way to go as any. I don't know much about other countries, but here in the US, Linux jobs are becoming increasingly popular. The Linux Foundation has reported a fairly substantial growth in employers looking for Linux skills, IIRC.
One word of advice, though - pick a skillset based on what you want to do, rather than just because you think you'll make a lot of money. The people who tend to succeed are those that are passionate about their work, regardless of the field. Also, don't lock yourself into one technology or programming language; these things come and go. But if you have solid analytical and systems skills, you'll be able to weather technology changes and pick up on what's hot on any given day.