I personally go to publish in any Journal without impact factor important. The target is to be free principle because I pay from my money. So, any Journal requested money I will stop continue. The impact factor doesn't mean important from my point of view.
The actual results are the honest target but the fabricated is an opposite style.The high impact factor is the same as low one, sometimes. Also, nowadays the university requirements is the suitable way for assessment.
As long as fabricated data goes unnoticed its OK but once caught the reputation of the researchers comes down to zero. Sometimes they are punished, sometimes no steps are taken against them. They move with a smiling face as usual.
Actually, it is very difficult to calculate the research impact.
In any case, IF is generally used to evaluated the quality of a given journal and can be used to drive the academic libraries to make or not a subscription to it.
For a researcher, an important parameter to evaluated his work, is the H-index which consider the number of publications and the number of citations per publication.
Nevertheless, we have to take in account that publish in journals with high IF, give us more possibilities to improve our H-index.
This is due to the pressure of publish or perish. Fabricated data is difficult to be identified for experimental results. It is very costly and time consuming. Many black sheeps have entered the Research Profession. Then there is pressure to get Ph.D degree. Academic scams are more difficult to be find out. The good thing is that the fale data will eventually be found out.
Fabricated results are often practiced by corporate researchers with the agenda to promote whatever they're trying to introduce into the market and by researchers who desperately wants to proof their assumptions. To answer to your first question I think it is important for you to choose the journal for publishing your work wisely and to do so you need to take few factors into consideration such as the intention of your research, your target audience and the quality of the research papers published in that particular journal. There's an ocean of information available on the internet these days and only a small proportion gave you true facts backed by true scientific evidence, because of this I suggest you published your paper in journals that you think is relevant to the context and that can help you reach your target audience.
Your number of publications will definitely affect your status as a researcher, when you're conducting a research its only ethical for you to share it with the world or else it will reflect upon your competency as a researcher, publication is like a formal documentation of your hard-work.
Fabricated results and fraud are issues plaguing science publishing probably because of the "publish or perish"syndrome. If you are doubtful about the genuineness of the data, then do not induce others to rely on the observation or findings. You should overcome the temptation to publish the “findings” with the doubtful data in the form of research papers or otherwise.
For a successful academic career, publications are necessary especially to get promotions or new jobs. In fact, many institutions rate their scientists based on the number and quality of publications made out of research. So, bother numbers and quality( read impact factor) are important.