Excessive fertilizer salts will inhibit microbial activity. Think CHLORINE might sanitize? Ammonia? Compost has very little nutritional value in most cases and is not considered a fert as much as a soil amendment. Mulching is the ONLY way to go and if you aren't because you're worried about your million dollar clients, ours don't have a problem with needing LESS fertilizer and improved soil as a result. I DO mulch MY leaves into my yard but no, it wouldn't be acceptable for most paying customers. Maybe YOU'RE in the business of manipulating the grass for profit, I make a living taking CARE of the earth and trying to improve the living conditions on OUR planet. The fact that it makes lawns BETTER is just a fringe benefit. You claim the knowledge, ought to know that stuff. You don't know as much as you think you do.