No it doesn't make them silly. The only thing silly about it is what you base your belief on.
Now what would be silly is if I read 3 articles about how EX-President Nixon flogged frogs as a hobby. Would I accept the three articles? Especially if they were written by the same person?
Get out and do some field research. For UFOs get out and do a sky watch. Look for strange things in the sky. Video them if you can. then try to find out what they may be. After finding something you can't explain, you'll have something for your UFO file. Are they aliens? We don't know. Just because we don't know what it is right now, we can't assume it's alien.
The same thing with ghosts. Investigate for yourself with friends. Be serious about it. Don't joke around about investigating. Take lots of notes and pictures/videos of the location. If you come across something that startles/scares you, in your notes indicate time of day, what the weather was like,what you were doing at the time. Be like a police investigator like on CSI. When you come up with things you can't explain, you'll something for your ghost file.
Keep in mind, just because it can't be explained today, it doesn't mean that it won't be explained in the future. Be a skeptical believer. Learn as much as you can so you can speak from a broad base of knowledge.
Also, when you go out to investigate ghosts, I suggest you say a prayer asking for your Gods protection during the investigation. Just in case ghosts are real.
I've been chasing ghost for a while so if there is anything I can help you with please let me know.