Mixing up qual and quant within a study has major benefits. A qualitative element allows for the data to become even more meaningful by providing rich context for more robust quant questionnaire design, or the necessary vocabulary and texture to provide more meaningful analysis of numbers-based results.
Online platforms have made consumer research more cost effective than ever before, and where budgets are particularly constrained, using a combination of both qual and quant can provide deeper insights where studies are constrained in size and scope.