There is a spirited discussion on the Softrocks forum concerning the legality of WSPR transmissions under FCC rules. In this discussion one person has complained about "high power, continuous WSPR transmissions", especially on 40 meters. Out of curiosity I took a look at recent database postings and it does seem that there is a great deal more power being used than is necessary in some cases.
There is one guy running 1000 watts! 7 running 50, 9 running 20.... etc. There is simply no need for such power levels on HF WSPR.