Is wordpress big enough for my project

I have a site some having job postings running using jobber base. Now I am going to shift it in WP using jobroller theme that is of 99 USD. I am a developer who always like MVC rather than these CMS. I was thinking of doing it in Yii. But now I came to know about job roller. So I have 2 questions.

Is jobroller worth 99 USD and will it work for my product? Can WP handle this if I want to do changes every week. As I told earlier, I am also a developer. So I will be doing changes in it but I doubt that I will not be able to do this in such friendly way as it can be easily done in an MVC framework. I am always in favor of OOP and MVC. But I actually don't have much time to develop my own.

So guys please advise me that should I spend some more time and do it in MVC once or I should once continue with WP? Can any one tell me about big sites that are developed in WP?