Agree with Supralex . There is a meaning of placing祿between羊陀.
Don’t want to discuss the reason or purpose of why ‘祿存’exists at a particular area/house. Give some thoughts to the meaning of ‘祿存’ itself, and think about its features & functions. ‘祿存’ means blessings - it consists of features like prosperity and fame. Comparatively speaking, ‘祿存’ always ‘passively’ draws attention to itself (centre of the attention ) . Under the rule of Yin-Yang, ‘祿存’has its darker side itself or risk in arousing jealously from others. (I would say ...inevitably - jealously meant to be happened.) That’s why ‘祿存’ could be a burden, especially when too much blessings happening, while other aspects of life loses their balance.
Say for example: ‘A’ has ‘祿存’ at 命, he appears to be so lovable , so much love around him. However, would people around him feels the same way or see this as a blessing? How about when ‘A’ always appear to be so lucky, (under the rule of易學之對待) -relatives and friends, especially siblings(of course depends on their characteristics) may start gossips & comparing, which can sometimes lead to real burden or troubles to the命主.
Or let’s say: ‘A’ is richer among his peers. Will others feel happy for him, accept his ability , his earning power, or think that he is just one lucky man in the world, things of course come easily.
Likewise, fair enough - everyone has天刑. When 天刑comes into a specific house, that means命主will encounter obstacles and difficult situations within this environment . By giving extra patience and finding the right solution is the key to handle天刑 . Therefore, the most important of all is to accept having天刑at the first place , know what it is , and wisely find the appropriate solution . After overcoming difficulties, the best is yet to come.
羊陀夾祿can be painful sometimes . 有得有( ),still we can always enjoy the best part of it. ‘祿存’ has its ability to solve problem too. So, no worry, that’s life !
. Under the rule of Yin-Yang, ‘祿存’has its darker side itself or risk in arousing jealously from others. (I would say ...inevitably - jealously meant to be happened.) 
That’s why ‘祿存’ could be a burden, especially when too much blessings happening, while other aspects of life loses their balance. 
However, would people around him feels the same way or see this as a blessing? How about when ‘A’ always appear to be so lucky, (under the rule of易學之對待) -relatives and friends, especially siblings(of course depends on their characteristics) may start gossips & comparing, which can sometimes lead to real burden or troubles to the命主. 
. By giving extra patience and finding the right solution is the key to handle天刑 . Therefore, the most important of all is to accept having天刑at the first place , know what it is , and wisely find the appropriate solution . After overcoming difficulties, the best is yet to come. 
. 有得有( ),still we can always enjoy the best part of it. ‘祿存’ has its ability to solve problem too. So, no worry, that’s life ! 
