While studies indicate that university professors spend much of their time engaged in personal research not clearly related to teaching, it is unlikely that additional financial compensation for, say, a larger course load or longer office hours would be the most effective of various possible means of shifting the focus of their activities; this would be the best means only if their motivation to educate were no more than a mechanical response to the prospect of more money, which surely is not the case
The research conducted by most professors should be clearly related to their teaching activities.