would you marry someone for 1 and a half years that you didn't really know and who's work visa is expiring for 20,000 dollars?
Keep in mind you have a girl/boyfriend and that is unsure as to whether or not he/she wants you to do it. And the two of you want to move in in about a year together.
Well, what does "marry someone" really mean? If it just means filling out some paperwork and collaborating on taxes, then sure. Them's good money.