It's neither right nor wrong. It depends on the scope and 'tradition' of the journal. It varies from journal to journal - but there is usually a stated limit in established journals. It depends on several factors i.e are there more tables/figures than main text content - which is not usually encouraged. Also - is it a qualitative or quantitative article. Quantitative manuscripts rely a lot more on tabulated data - qualitative far less so. However, qualitative data (especially say Grounded Theory) may result in conceptual models and, therefore, more figures. Again - there is also the issue of production costs. Figures (and tables) generally cost more to process than 'normal text' especially, for instance, if the figures are in colour.
It's neither right nor wrong. It depends on the scope and 'tradition' of the journal. It varies from journal to journal - but there is usually a stated limit in established journals. It depends on several factors i.e are there more tables/figures than main text content - which is not usually encouraged. Also - is it a qualitative or quantitative article. Quantitative manuscripts rely a lot more on tabulated data - qualitative far less so. However, qualitative data (especially say Grounded Theory) may result in conceptual models and, therefore, more figures. Again - there is also the issue of production costs. Figures (and tables) generally cost more to process than 'normal text' especially, for instance, if the figures are in colour.
It is according to journal policy which an author can't bypass. Each journal may have its own page restriction according to the type (letter, full length, review, communication etc.) of article. For example, letter type journals does not allow more than four figures. If your article is too lengthy with too many figures (>20), you may consider splitting the article into two studies and submit to two journals.
I do agree with Dr.Dean Whitehead post. Regardless to any other numbers, you as a researcher have to add a sufficient and very important table and figures based on the actual need in such a way that present a very precise and clear clarification of the case study under consideration.
Sure there should be a limit to make it attractive and readable. Also, if there is a page limit (usually the case for reputed journals as well as international conference proceedings) requirements.
There may be some restrictions on the Journals from the publisher side due to space. Authors are always left with only option that they have to plan their paper as per the guidelines of target journal.