Ah, the wonders of "coincidences"
Yes, if you only do 15 spins, the odds of getting 15 in a row are 1 in 32,768. However, you played more than just 15 times. For someone playing 114 times, there are 100 stretches 15 spins long, of which any could be all reds.

Also, you would be saying much the same (probably) about a shorter run (say, for example, 10), which increases the probability of this occurring at some time further.

As for roulette in general, due to the 0, your average return is less than 1p for every 1p bet, there is no system that will go over this on average. They merely tend to limit the amount you lose at any one time. In fact, your expected return is just a good from playing the numbers.

edit: With 100 plays, at leat one run of at least 10 will occur approximately one time in ten. 6.54% if not including the "0" (i.e. a run of one colour), 10.96% if including the "0" (i.e. a run of losses)
( Tedium Alduce me to interlow myself., Fri 8 May 2009, 17:12, Reply)