After collecting rep pens for around ten years, I have seen a huge variation in products. I've owned reps costing $10 and some thst set me back more than $100. Some of the cheapies have been excellent value but the majority have been pretty poor quality. The 'expensive' ones have all been very good, with a few very close to their genuine counterparts.
With all this stuff, quality research and a willingness to learn by trial and error (mine or trusted others) are a must. Along the way I have learned a fair amount and enjoyed the pursuit. I have also grown in understanding about the range of things that come together to not only make a really fine pen, but to get the public to pay up to $70,000 and more for them.
So I say: buy as many cheap pens as you like. Enjoy them and chuck them when you tire of them or they break. If you develop a deeper interest, and find a pen you'd like to keep longterm, buy 4 or 5 cheapies just in case, or buy one of high quality.
All of this is simply my opinion and worth precisely what you paid for it