No it is not waste of money infact it might help you as choclate cyst
n tube blockage indicates you have endometriosis
...and there is hormonal
imbalance associated so with these factors iui would be helpful as in this procedure sperms are directly deposited in your uterus
..so reduces the distance they need to travel and hence increase the chances of conception so don't worry and go ahead as per your doctors advice . All the Best.