This is a really good question and I think the answer to your question is yes, there is a massive chance that youth ministries could be way more focused on "attracting" youth than the more important part which is leading young people well when you have them.
Now, having a youth ministry that is alive, active, fun, full of energy and excitement, is awesome. Having the sound, lighting, cool T-shirts, fantastic worship and a great environment is key. It is key, but just tools. And If all the above mentioned stuff is made into an ultimate thing, we really need to be checking ourselves. There isn't anything wrong with the above, but the above cannot be the things we are focused on the most.
If your youth ministry is more focused on the above then on the actual people, then unfortunately all you'll end up with is a cool event that is competing with the world.
When you are so deeply focused on the gospel, and only the gospel, without taking into consideration your environment, then the conversation can become quite dry, An non interesting, perhaps a little awkward. This is also not the best idea.
For me, the "win" is the following:
We should be excited about creating a great environment, along with great worship and a solid word, good leadership structure and a REAL interest in spending time and investing into young people.
Attracting VS Gosple in my opinion will give you the following result:
Attraction: A youth ministry that looks for and thrives on encouragement, noticability and popularity. Once they "the students" aren't noticed or encouraged, they will go to the next event to find it. All swag, but no depth.
Gosple: This is good, very good. It's what we are called to do. Teach young people about the love of the father, the grace that is freely given, one that we cannot work for. A salvation that changes our lives, and a baptism gives us new life, the old has gone the new has come! This is good, but if this is your one and only focus, you are attracting only one type of person, a Christian.
When these two things go together Attraction & the Gosple, here is your result:
A generation that know who they are, because they know who's they are. A generation that are trend setters and not just trend followers. A generation that knows how to have fun, in a way that is honorable. Boys who know their strength, their responsibility their call and know what their future looks like because of their father. Girls who are confidant, girls who know their worth and value. You'll end up with a youth ministry that is full of young people who have character, who have depth, who understand the gosple, and who want to share the gosple.
These two things go hand in hand.