Nah, people kite there. There will be people to lift your kite.
Yup, local people do kite in Kos. Google Big Blue Surf Center in Kos, the guy who owns it runs kiting lessons from May onwards and he can tell you over the phone / email / FB where the local kiters gather for each particular wind direction. Once you have the name of the beach and the time that they tend to gather, you 're ready to go! BTW, you 're lucky in that there will be wind, this is not a good time of the year for wind, as Dimitri pointed out. But no need to come to Rhodes (although you 're very welcome to come, PM me if you do, I will direct you to where kiting happens here