Not really. Many guys use TTOT and TTS to dump their entire schedules almost down to zero... then rebuild using MU by choosing to fly smarter, not harder...for example only choosing the highly coveted 1-1s where you DH down on the last flight, layover and work a quick flight back... which pays 10:20 for what can be a quick 45 minutes of work.

My Md80 FO buddy in DFW flew only 220hrs hard time last year and yet made $220k by doing just this. He dumps his entire schedule every month down to zero and uses MU to rebuild a schedule where he may only fly maybe 35-40hrs of hard time yet get paid for 90.

MU is great if you use it wisely.