Some people, including myself and it seems OP, love open source but aren't dogmatic about it. I see no contradiction between using open source and proprietary software. In fact I think both models have benefits that the other lacks.
I agree with widdershins. One can use many tools each with their own merit but I'm not opposed to closed source by principle (it's their choice and sometimes their mistake). An open source version of Svbtle would be very easy to code, but the value lies in the design, workflow, feature elimination, etc