Is it a good thing or a bad thing?

Three weeks ago I started working part-time at a company that has a great team of people. There are drawbacks though, from no benefits for health insurance, dental, or vision, no pension or retirement plan, pays only once a month and for the better part of the year you only work 28 hours per week. Today I found out that the only way to increase one's hourly rate is to increase the amount of sets of books we complete each month. In order to get a raise you need to successfully manage TEN sets of books. There is one woman there that has been there for five years and is still making the same amount of money as when she started. My boss said it all depends on how hard you want to work for your money. If we want to make a dollar more per hour then we need to get our skills honed to take on those ten sets and soon ... sigh ... wish me success! There are benefits that tend to make this job a desirable one, like a great cast of characters to work with, a Spanish class on Mondays and Thursdays, and three day weekends. I hear tell there are paid holidays, a holiday bonus and a tax season full of hours to stock up on the months with less pay. So, for now we work.