"If it is free, it can't be good"
Let the numbers speak for themselves. Take a look here. As you can see, the sites with the highest uptime is either using Apache, which is an open source project or FreeBSD, which is an open source platform. An uptime of 1600+ days (approximately 4.5 years and going) is no joke.
"Open source can't be secure. The source code is freely available"
On the contrary, since the source code can be reviewed by anyone, that makes it easy for developers or hackers worldwide to make a suggestion of they find something amiss. Apparently, this method has proven itself to be superior in terms of security response time. It also results in a much more secure system.
"Support for Open Source is hard to find"
Try looking harder. You might be pleasantly surprised.
"I want to know more about Open Source"
Here is a good place to start. Remember, Google is like The Oracle in the movie, The Matrix. Alternatively, you can always contact us.