I have no idea why skylights would leak on a steep pitched roof. I have 5 skylights on my roof, they are steep, they have never leaked. If they are quality skylights and installed properly, you should have no problems. One caution, make sure the installer use step flashing under the shingles- it makes a major difference. These are angled pieces of aluminum or stainless that alternate with the shingle installation. Enjoy the brightness and warmth in the winter. When the sun shines it will heat up your whole house in the winter. For the summer heat, purchase the shades that you close to keep the sun away.