You're not going to sell to individuals, but companies are perfectly willing to pay for profiling tools if they're better than the open source alternatives. You

You're not going to sell to individuals, but companies are perfectly willing to pay for profiling tools if they're better than the open source alternatives. You can sell it on the basis that it's going to save a company X many developer hours/year. There are free Java and C++ profiling tools, that doesn't stop Rational Quantify or JProfiler from selling.