Or you turn your amp down until it just does not clip. As Seth=L said, the difference between 100W/140W is negligible. Does one want to pay for that? There is also the old addage (probably well-known on this forum) that when choosing an amplifier, one does not consider between outputs less than X2 (3 dB). Just not audible enough.
In a slightly different vein, I frown on so-called superior loudspeakers with the impedance all over the place, especially on the low side. In this year of computer programs, I have great difficulty believing that reactive networks that smooth the loudspeaker impedance still seem "inaccessable". Must the amplifier designers always stand in for such products?